Ok, so.. update;

Just drove this thing from Belleville to Sudbury. Drove like a charm all the way up. As soon as I got into town and stop-go traffic, the tranny started shifting like crap.

Here's what I know:

The tranny fluid was changed 3 months ago.
The TPS is throwing a code. The CEL will come on for a bit, then shut off, then come on, then shut off. Pulling the code shows TPS (Code 14)

Here's what the tranny is doing:

Having a hard time kicking down when warm.
When I come to a stop, the tranny will downshift rather hard.
I can launch the damned car when I throw it into reverse.
Shifting from 2-3 or 3-4 may require me to punch it up to 3500 before it will shift.
"POWER" and O/D work, but don't make a difference.

So... There are a few things I feel may be causing this. If anyone has any experience with the 1G Auto tranny's, chime in.

A: ISC (duh)
B: TCU
C: Synchro's
D: Kickdown switch

Any thoughts all? Remember All the above symptoms are when the car is warm! Drives like a charm when it's cold. Also, my T-Stat needs to be replaced, so when the car is stopped, it will get to operating temperature, however when I drive it, the temp does go down.

The transmission will begin screwing up after it has been driven around a while.

Thanks.